linux-kernel - [PATCH] media: vsp1: Fix BRx conditional path in WPF

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Date:   Mon, 26 Mar 2018 14:29:17 +0100
From:   Kieran Bingham <kieran.bingham@...asonboard.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Cc:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        stable@...r.kernel.org, linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] media: vsp1: Fix BRx conditional path in WPF

When a BRx is provided by a pipeline, the WPF must determine the master
layer. Currently the condition to check this identifies pipe->bru ||
pipe->num_inputs > 1.

The code then moves on to dereference pipe->bru, thus the check fails
static analysers on the possibility that pipe->num_inputs could be
greater than 1 without pipe->bru being set.

The reality is that the pipeline must have a BRx to support more than
one input, thus this could never cause a fault - however it also
identifies that the num_inputs > 1 check is redundant.

Remove the redundant check - and always configure the master layer
appropriately when we have a BRx configured in our pipeline.

Fixes: 6134148f6098 ("v4l: vsp1: Add support for the BRS entity")
Cc: stable@...r.kernel.org

Suggested-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Kieran Bingham <kieran.bingham@...asonboard.com>
---
 drivers/media/platform/vsp1/vsp1_wpf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/vsp1/vsp1_wpf.c b/drivers/media/platform/vsp1/vsp1_wpf.c
index f7f3b4b2c2de..8bd6b2f1af15 100644
--- a/drivers/media/platform/vsp1/vsp1_wpf.c
+++ b/drivers/media/platform/vsp1/vsp1_wpf.c
@@ -452,7 +452,7 @@ static void wpf_configure(struct vsp1_entity *entity,
 			: VI6_WPF_SRCRPF_RPF_ACT_SUB(input->entity.index);
 	}

-	if (pipe->bru || pipe->num_inputs > 1)
+	if (pipe->bru)
 		srcrpf |= pipe->bru->type == VSP1_ENTITY_BRU
 			? VI6_WPF_SRCRPF_VIRACT_MST
 			: VI6_WPF_SRCRPF_VIRACT2_MST;
-- 
2.7.4